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Method for predicting thin layer thickness by utilization of time-frequency spectrum cross plot changing along with geophone offsets

A technology of time-spectrum and offset, which is applied in the field of seismic exploration and achieves the effect of broad application prospects

Active Publication Date: 2015-01-14
BC P INC CHINA NAT PETROLEUM CORP +1
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Therefore, these methods have certain limitations in practical applications

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  • Method for predicting thin layer thickness by utilization of time-frequency spectrum cross plot changing along with geophone offsets
  • Method for predicting thin layer thickness by utilization of time-frequency spectrum cross plot changing along with geophone offsets
  • Method for predicting thin layer thickness by utilization of time-frequency spectrum cross plot changing along with geophone offsets

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[0033] I build figure 1 The thin-layer model in ;

[0034] II pair figure 1 Forward modeling of the model in Fig. 2 is obtained;

[0035] III Decompose the time-frequency spectrum on the gather in Fig. 2 to obtain the time-frequency data body ( image 3 is the schematic diagram of the time-spectrum data volume).

[0036] IV Take out the corresponding data in the time-spectrum data body according to the determined ranges of near and mid-range offsets, the length of the time window and the frequency, and form the time-spectrum sequence of the near-offset and the time-spectrum sequence of the mid-to-far offset. The time-spectrum sequences of offsets and COSCO offsets are intersected to form an intersection graph ( Figure 4 ). It can be seen from the intersection diagram that the present invention can clearly distinguish different thin layer thicknesses.

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Abstract

The invention relates to a method for predicting a thin layer thickness by the utilization of a time-frequency spectrum cross plot changing along with geophone offsets. According to the method, time-frequency spectrum decomposition is performed on a trace gather to obtain a date cube, and the ranges and time window lengths of the near geophone offset and the middle-far geophone offset are selected; integral multiples of frequencies are used for fetching data out to form a time-frequency spectrum of the near geophone offset and a time-frequency spectrum of the middle-far geophone offset, and the time-frequency spectrum of the near geophone offset and the time-frequency spectrum of the middle-far geophone offset are crossed to form the time-frequency spectrum cross plot changing along with the geophone offsets; logging data are firstly used for synthesizing seismic forward modeling trace gathers different in thin layer thickness, and a time-frequency spectrum cross plot of the forward modeling trace gathers is used; the time-frequency spectrum cross plot of the field trace gather is compared with the time-frequency spectrum cross plot of the forward modeling trace gather, so that the thin layer thickness of underground media is obtained. The new method is used for predicting a thin layer of which the thickness is smaller than quarter of wavelength.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, and belongs to a method for predicting the thickness of a thin layer by using a time-frequency spectrum intersection graph varying with offsets in seismic data processing. Background technique [0002] Thin layers are one of the important targets of seismic exploration. For thin layers thicker than a quarter wavelength, one can predict the thickness of the thin layer with relative accuracy. But for thin layers less than a quarter wavelength thick, people are trying to make predictions in different ways. [0003] At present, the main methods for predicting thin layers with a thickness less than a quarter wavelength using seismic data are divided into seismic attribute technology, seismic inversion, spectral decomposition technology and edge detection and other technical methods. These methods use seismic amplitude, frequency spectrum, and comprehensive seismic attributes to establish...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 张铁强孙鹏远马光凯
Owner BC P INC CHINA NAT PETROLEUM CORP
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